The calculated distance (air line) between Bydgoszcz and Zielona Góra is approximately 133 miles respectively 215 kilometers.
By car or train, the actual journey to Zielona Góra is certainly longer, as only the direct route (as the crow flies) between Bydgoszcz and Zielona Góra has been calculated here.
Air line (approximately)
215 kilometers
116 nautical miles